Improvement in automatic circuit-breakers for electro-harmonic telegraphs



E. GRAY. v I AUTOMATIC CIRCUIT-BREAKERS FOR ELEGTRO-HARMONIC TELEGRAPHS.

Patent ed Fe'b.15,1876.

M 77 9% ix ///J A r ran/v57 NPEYERS, PHO HER. WASHINGTON D C UNITE STATES PATENT OFFICE,

ELISHA GRAY, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN AUTOMATIC CIRCUIT-BREAKERS FOR ELECTRO-HARMOMC TELEGRAPHS.

Specification forming part of Letters Patent No. 173,460, dated February 15, 1876; application filed January 8, 1876.

To all whom it may concern:

Beit known that I, ELISHA GRAY, of Ohicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Automatic Circuit-Breakers for Electro-Harmonic Telegraphs, of which the following is a specification:

My invention relates to electro-harmonic telegraphs of the class secured to me by Letters Iatent of the United States numbered, respectively, 176,095 and 1 166,096, granted July 27, 1875. Its object is to produce a simple and effective circuitbreaker vibrating automaticallywith sufficient rapidity to produce a musical tone of a given pitch, the electrical impulses thus generated being transmitted through an electric circuit, and reproduced at the other end of the line, as set forth in my patents above mentioned; to which end my improvement consistsin combining with an organ, or other wind-pipe, a diaphragm vibrated by sounding said pipe, and an electric circuit connected with said diaphragm so as to be opened and closed by its vibrations.

In the accompanying drawings, which exemplify one of the best ways now known .to me of carrying out the objects of my invention, Figure 1 represents a plan view of .my

' improved apparatus Fig. 2, a side view; and

Fig. 3, a longitudinal vertical section therethrough on the line m m of Fig. 1.

An organ-pipe, A, is shown as made with 2 an opening, a, in its side, over which a membranous diaphragm, b, is stretched. One wire of the circuit is connected with a binding-post, G, from which a wire, 0, leads to a platina point, b, on the diaphragm underneath a set-screw, D, mounted on a bar or frame, 01, connected with a bindiug'post, E, to which the other wire of the circuit is attached.

When the column of air in the pipe is vibrated by sounding the pipe the diaphragm will vibrate correspondingly with the musical tone thus produced, and open and close the circuit accordingly, thus transmitting the vibrations to the receivinginstrument for utilization, as mentioned in my patents before referred to.

Obviously the vibrations of several pipes giving notes of different pitch may be simultaneously transmitted through a single-wire by suitable mechanism.

I claim- The combination, substantially as hereinbefore set forth, of an organ-pipe, a membranous diaphragm vibrated by sounding said pipe, and an electric circuit opened and closed by said vibrations.

In testimony whereof Ihave hereunto subscribed my name.

. ELISHA GRAY. Witnesses:

Enos M. BARTON, GEO. .El. BLIss. 

